32956: link ffmpeg and imagemagick features to the spkg

Author: seblabbe

src/sage/features/ffmpeg.py

@@ -34,4 +34,5 @@ def __init__(self):
             True
         """
         Executable.__init__(self, "ffmpeg", executable="ffmpeg",
+                            spkg="ffmpeg",
                             url="https://www.ffmpeg.org/")

src/sage/features/imagemagick.py

@@ -44,5 +44,5 @@ def __init__(self):
         """
         JoinFeature.__init__(self, "imagemagick",
                              [Executable("convert", executable="convert")],
-                             spkg="_recommended",
+                             spkg="imagemagick",
                              url="https://www.imagemagick.org/")